The Global Maritime Distress and Safety System (GMDSS) provides a fast and efficient way of calling for assistance at sea, whatever the size of craft or geographical position. Now updated for the fourth edition, this book explains the operation of the system as a whole and the procedures involved, as well as covering the syllabi of the General Operator's Certificate (GOC), the Long Range Certificate (LRC), and the Restricted Operator's Certificate (ROC). GMDSS: A User's Handbook has proved an invaluable reference for both exam candidates and equipment users alike. 'The ideal publication' Cruising 'Concise and lucid practical guidance' The Nautical Magazine 'A useful guide for those taking examinations...or those who need to brush up on procedures' Lloyds List